Experimental and numerical findings of built hierarchical lattice parts, formed by replacing the cell walls with small-scaled triangular hollow structures of different wall thickness. (a) stress-strain response curves generated from crushing experiments of the hierarchical lattice structures, (b) stress-strain response curves generated from numerical crushing of hierarchical lattice structures, (c) deformation behaviour and failure patterns captured in experimental crushing of hierarchical lattice structures, and (d) deformation behaviour and distribution of stress observed in numerically modelling hierarchical lattice structures [35].